Let us take the case of 7 pounds for $8.47 first. 7 pounds of a product costs = 8.47 dollars Then 1 pound of the same product will cost = (8.47/7) dollars = 1.21 dollars Now let us take the case of 9 pounds for $11.07 9 pounds of a product costs = 11.07 dollars Then 1 pound of the same product will cost = (11.07/9) pounds = 1.23 dollars So from the above deductions we can see that 9 pounds for $11.07 is a better buy than 7 pounds for $8.47. I hope the procedure is clear enough for you to understand. In future you can use this method for solving similar problems.
